岩石钻孔 干式钻杆和钻头 连接尺寸
Rock drilling - Rotary drill-rods and rotary drill-bits for dry drilling - Connecting dimensions

2006-12-20

Rock drilling — Rotary drill-rods and rotary drill-bits for dry drilling — Connecting dimensions
凿岩与粉煤灰；干式钻井用旋转钻杆和旋转钻头——连接尺寸

1974-06-01

Specification for rotary drill rods and tungsten carbide tipped rotary drill bits
旋转钻杆和碳化钨钻头规范

1974-12-31